linux-kernel - Re: [PATCH v2 05/11] power: bq25890: fix ADC mode configuration

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Date:   Sun, 3 May 2020 22:01:55 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 05/11] power: bq25890: fix ADC mode configuration

Hi,

On Sun, May 03, 2020 at 05:21:11PM +0200, Michał Mirosław wrote:
> Datasheet describes two modes for reading ADC measurements:
> 1. continuous, 1 Hz - enabled and started by CONV_RATE bit
> 2. one-shot - triggered by CONV_START bit
> 
> In continuous mode, CONV_START is read-only and signifies an ongoing
> conversion.
> 
> Change the code to follow the datasheet and really disable continuous
> mode for power saving.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> ---
>  drivers/power/supply/bq25890_charger.c | 33 ++++++++++++++++++++++----
>  1 file changed, 28 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
> index 9339e216651f..3b02fa80aedd 100644
> --- a/drivers/power/supply/bq25890_charger.c
> +++ b/drivers/power/supply/bq25890_charger.c
> @@ -126,6 +126,7 @@ static const struct regmap_access_table bq25890_writeable_regs = {
>  
>  static const struct regmap_range bq25890_volatile_reg_ranges[] = {
>  	regmap_reg_range(0x00, 0x00),
> +	regmap_reg_range(0x02, 0x02),
>  	regmap_reg_range(0x09, 0x09),
>  	regmap_reg_range(0x0b, 0x14),
>  };
> @@ -374,18 +375,40 @@ enum bq25890_chrg_fault {
>  	CHRG_FAULT_TIMER_EXPIRED,
>  };
>  
> +static bool bq25890_is_adc_property(enum power_supply_property psp)
> +{
> +	switch (psp) {
> +	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_NOW:
> +	case POWER_SUPPLY_PROP_OUTPUT_VOLTAGE_NOW:

^^^ does not compile without your other patchset, so not applied.

When you send a new version, please Cc some of the recent
contributors to bq25890_charger.c, so that they have a chance
to test the changes with their setup:

Angus Ainslie (Purism) <angus@...ea.ca>
Yauhen Kharuzhy <jekhor@...il.com>

-- Sebastian

> +	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
> +	case POWER_SUPPLY_PROP_CURRENT_NOW:
> +		return true;
> +
> +	default:
> +		return false;
> +	}
> +}
> +
>  static int bq25890_power_supply_get_property(struct power_supply *psy,
>  					     enum power_supply_property psp,
>  					     union power_supply_propval *val)
>  {
> -	int ret;
>  	struct bq25890_device *bq = power_supply_get_drvdata(psy);
>  	struct bq25890_state state;
> +	bool do_adc_conv;
> +	int ret;
>  
>  	mutex_lock(&bq->lock);
>  	state = bq->state;
> +	do_adc_conv = !state.online && bq25890_is_adc_property(psp);
> +	if (do_adc_conv)
> +		bq25890_field_write(bq, F_CONV_START, 1);
>  	mutex_unlock(&bq->lock);
>  
> +	if (do_adc_conv)
> +		regmap_field_read_poll_timeout(bq->rmap_fields[F_CONV_START],
> +			ret, !ret, 25000, 1000000);
> +
>  	switch (psp) {
>  	case POWER_SUPPLY_PROP_STATUS:
>  		if (!state.online)
> @@ -623,8 +646,8 @@ static int bq25890_hw_init(struct bq25890_device *bq)
>  		}
>  	}
>  
> -	/* Configure ADC for continuous conversions. This does not enable it. */
> -	ret = bq25890_field_write(bq, F_CONV_RATE, 1);
> +	/* Configure ADC for continuous conversions when charging */
> +	ret = bq25890_field_write(bq, F_CONV_RATE, !!bq->state.online);
>  	if (ret < 0) {
>  		dev_dbg(bq->dev, "Config ADC failed %d\n", ret);
>  		return ret;
> @@ -966,7 +989,7 @@ static int bq25890_suspend(struct device *dev)
>  	 * If charger is removed, while in suspend, make sure ADC is diabled
>  	 * since it consumes slightly more power.
>  	 */
> -	return bq25890_field_write(bq, F_CONV_START, 0);
> +	return bq25890_field_write(bq, F_CONV_RATE, 0);
>  }
>  
>  static int bq25890_resume(struct device *dev)
> @@ -982,7 +1005,7 @@ static int bq25890_resume(struct device *dev)
>  
>  	/* Re-enable ADC only if charger is plugged in. */
>  	if (bq->state.online) {
> -		ret = bq25890_field_write(bq, F_CONV_START, 1);
> +		ret = bq25890_field_write(bq, F_CONV_RATE, 1);
>  		if (ret < 0)
>  			return ret;
>  	}
> -- 
> 2.20.1
> 

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